Malicious PDF — malware analysis report

Static analysis result for SHA-256 b595a0be49851634…

MALICIOUS

PDF

67.5 KB Created: 2021-03-28 16:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4acc50ec7ca11268fb021d08aec15073 SHA-1: 9db69d3a6dcf148aa7e73147db3f50bd1e358e7f SHA-256: b595a0be498516340031f62fafd8f88dff0c9c71165ae9922d976de5945c8ec0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=advanced+chemistry+with+vernier+lab+19+answers PDF link annotation
    • https://cdn.sqhk.co/ludozenidi/hdihiea/football_manager_2016_5_star_coaches.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jhjjhe7/pesawowegagumeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/aJudlEX/tower_defense_castle_fantasy_td_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/X6KvKgc/extreme_off_road_rally_racing_near_me.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/surf_fishing_equipment_for_beginners.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/cracking_the_pm_interview_gayle_laakmann_mcdowell.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ljggdvx/virtual_beggar_apk_mod_3._323.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/2712582.pdfIn PDF document text
    • https://bugasidajuw.weebly.com/uploads/1/3/1/8/131856032/9453458.pdfIn PDF document text
    • http://oneplusonemain.xyz/why_has_my_dyson_head_stopped_spinningj61g7.pdfIn PDF document text
    • http://goldenframecollision.com/3d_interactive_human_anatomy_free25ae7.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/finomuv.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/rakexomazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muliwavanebebo.onlinewebshop.net/english_sentences_with_marathi_meaning.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/tiseguxadelesalozutimoren.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/41283398860.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/wubomuzepibo.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/60827447864.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/how_to_run_python_code_in_atom_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/xatebujozetov.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/animal_kingdom_classification_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/tewosozepinuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/ligug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 5772 bytes
SHA-256: b188d464c7724b113738e15ecbc4a4ddfeceeea71cb7f140417f00acb8109c72
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 9720 bytes
SHA-256: 4675b4876666a8ee163ac62298521c772afaac72b55c47ced248b3a4d2f8e736

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